Identifiers for iOS 7 and a next-generation iPhone have started appearing in app usage logs, several developers say. One developer in particular has recorded an "iPhone6,1" device running iOS 7; for reference, the iPhone 5 is listed either as "iPhone5,1" or "iPhone5,2," depending on the cellular bands it uses. The new identifiers are linked to an IP address at Apple's Cupertino headquarters, which suggests that Apple is testing out early builds of iOS 7 with pre-existing apps.

Sources for the The Next Web say that Apple has been working on iOS 7 since late 2012, and that the final feature set for the firmware should be decided soon. The first developer seed of iOS 7 could be released to developers at Apple's Worldwide Developers Conference, normally held every June.

What an iPhone 6 (or 5S) might be equipped with is unclear. The same can be said for iOS 7, though one likely focus area is Maps, which has been roundly criticized in iOS 6 for inaccuracies, graphical problems, and missing features. Unlike the iOS 5 version of the app, Maps for iOS 6 lacks options like a street view or public transit directions.